Lina was climbing into her cod by herself. So in theory she should also be able to climb out. Since climbing out is a bit more risky (no mattress to break her fall), primarily Dirk was having some nightmare visions of all the things that could go wrong.
So therefore, despite the fact I loudly stated to keep Lina in a cod as long as possible (there is no pleasure in them being able to roam around free when they should be sleeping...), we changed her cod to a toddler bed.
She loves it! But yes, there is some effort going into keeping her in bed...